Example of Tooltip Template in ASP.NET Core Chart Control
This sample visualizes USA wheat production data with the default line series in the chart. Data points are enhanced with a background image and a tooltip template.
DEMO
SOURCE
In this example, you can see how to render and configure a background image and the tooltip template for the chart. You can use the BackgroundImage property to configure the background for the chart and the Template property in ChartTooltipSettings to customize the tooltip UI.
More information about the tooltip template can be found in this documentation section.